I'm think the hobby you're referring to is genealogy. It's actually a very common and useful hobby. :-) https://blogs.ancestry.com/cm/genealogy-second-most-pop

I'm think the hobby you're referring to is genealogy. It's actually a very common and useful hobby. :-) https://blogs.ancestry.com/cm/genealogy-second-most-popular-hobby-us/ https://blogs.ancestry.com/cm/genealogy-second-most-popular-...